Method and Device for Scheduling in Carrier Aggregation System

1. A method for scheduling in a carrier aggregation system, the method comprising: transmitting information for indicating a plurality of secondary cells to be scheduled through a joint coded control channel by using a higher layer signal; transmitting a separate coded control channel for scheduling a primary cell; and transmitting one joint coded control channel for scheduling the plurality of secondary cells, wherein the separate coded control channel is a control channel for scheduling one data channel transmitted through the primary cell, and the joint coded control channel is a control channel for scheduling a plurality of data channels transmitted through the plurality of secondary cells, and wherein if a semi-persistent scheduling (SPS) serving cell for performing semi-persistent scheduling exists among the plurality of secondary cells, a release of semi-persistent scheduling of the SPS serving cell is indicated by combining control information for scheduling the SPS serving cell in a joint coded physical downlink control channel (PDCCH).

2. The method of claim 1 , wherein the higher layer signal is a radio resource control (RRC) message.

3. The method of claim 1 , wherein the separate coded control channel and the joint coded control channel are transmitted through a primary downlink component carrier constituting the primary cell.

4. The method of claim 1 , wherein the joint coded control channel includes a plurality of control information fields, and at least one of the plurality of control information fields includes a control value commonly applied to the plurality of secondary cells.

5. The method of claim 1 , wherein the joint coded control channel uses only a downlink control information format for scheduling a specific number of secondary cells.

6. The method of claim 1 , wherein the primary cell and the plurality of secondary cells use a time division duplex (TDD) frame, and are applied with different TDD configurations.

7. The method of claim 6 , wherein if the plurality of secondary cells are applied with the different TDD configurations, the plurality of secondary cells are scheduled by the joint coded PDCCH only when all of identical subframes of the plurality of secondary cells are downlink subframes or uplink subframes.

8. The method of claim 1 , wherein the higher layer signal further includes information indicating a serving cell for transmitting the joint coded control channel.

9. The method of claim 1 , wherein the joint coded control channel uses only some control channel element (CCE) aggregation levels among CCE aggregation levels used in the separate coded control channel.

10. The method of claim 1 , wherein the joint coded control channel is transmitted in a common search space for transmitting control information common to all user equipments in the primary cell.

11. The method of claim 1 , wherein a plurality of data channels to be scheduled by the joint coded control channel include data channels transmitted through identical subframes of the plurality of secondary cells.

12. The method of claim 1 , wherein a plurality of data channels to be scheduled by the joint coded control channel include data channels transmitted through different subframes of at least one secondary cell among the plurality of secondary cells.

13. A method for operating a user equipment in a carrier aggregation system, the method comprising: receiving information for indicating a plurality of secondary cells to be scheduled through a joint coded control channel by using a higher layer signal; receiving a separate coded control channel for scheduling a primary cell; receiving one joint coded control channel for scheduling the plurality of secondary cells; and receiving a data channel of the primary cell by using the separate coded control channel, and receiving a data channel of the plurality of secondary cells by using the joint coded control channel, wherein the separate coded control channel is a control channel for scheduling one data channel transmitted through the primary cell, and the joint coded control channel is a control channel for scheduling a plurality of data channels transmitted through the plurality of secondary cells, and wherein if a semi-persistent scheduling (SPS) serving cell for performing semi-persistent scheduling exists among the plurality of secondary cells, a release of semi-persistent scheduling of the SPS serving cell is indicated by combining control information for scheduling the SPS serving cell in a joint coded physical downlink control channel (PDCCH).

14. An apparatus comprising: a radio frequency (RF) unit for transmitting and receiving a radio signal; and a processor coupled to the RF unit, wherein the processor transmits information for indicating a plurality of secondary cells to be scheduled through a joint coded control channel by using a higher layer signal, transmits a separate coded control channel for scheduling a primary cell, and transmits one joint coded control channel for scheduling the plurality of secondary cells, and wherein the separate coded control channel is a control channel for scheduling one data channel transmitted through the primary cell, and the joint coded control channel is a control channel for scheduling a plurality of data channels transmitted through the plurality of secondary cells, and wherein if a semi-persistent scheduling (SPS) serving cell for performing semi-persistent scheduling exists among the plurality of secondary cells, a release of semi-persistent scheduling of the SPS serving cell is indicated by combining control information for scheduling the SPS serving cell in a joint coded physical downlink control channel (PDCCH).